Process for preparing diphenylamines

Details Process for preparing diphenylamines Process for preparing diphenylamines

1996-02-13

1997-10-21

Trinh, Ba K.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C21155

Patent

active

056798563

ABSTRACT:
A process is described for preparing diphenylamines of the formula ##STR1## by oxybromination of a phenol ether compound using elemental bromine in the presence of hydrogen peroxide and of a catalyst to give a brominated phenol ether compound which is subsequently reacted with a formanilide compound to give the compound of the formula (1).
The oxybromination reaction is a regioselective, environmentally friendly and cost-efffective method of preparing brominated aromatic compounds.
The diphenylamines of the formula (1) are industrially useful intermediates for the production, for example of dyes, and in particular of color formers of the fluoran type for pressure- or heat-sensitive recording systems.

REFERENCES:
patent: 4517388 (1985-05-01), Braverman
patent: 4804783 (1989-02-01), Nagata et al.
patent: 5412150 (1995-05-01), Wassel et al.

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